1. Magnetic dipole excitations of 50Cr.
- Author
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Pai, H., Beck, T., Beller, J., Beyer, R., Bhike, M., Derya, V., Gayer, U., Isaak, J., Krishichayan, Kvasil, J., Löher, B., Nesterenko, V. O., Pietralla, N., Martínez-Pinedo, G., Mertes, L., Yu. Ponomarev, V., Reinhard, P.-G., Repko, A., Ries, P. C., and Romig, C.
- Subjects
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CHROMIUM isotopes , *MAGNETIC dipole moments , *NUCLEAR shell theory , *SPIN crossover , *COMPTON scattering - Abstract
The low-lying M1 strength of the open-shell nucleus 50Cr has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility between 6 and 9.7 MeV of the initial photon energy. Fifteen 1+ states have been observed between 3.6 and 9.7 MeV. Following our analysis the lowest 1+ state at 3.6 MeV can be considered as an isovector orbital mode with some spin admixture. The obtained results generally match the estimations and trends typical for the scissors-like mode. Detailed calculations within the Skyrme quasiparticle random-phase-approximation method and the large-scale shell model justify our conclusions. The calculated distributions of the orbital current for the lowest 1+-state suggest the schematic view of Lipparini and Stringari (isovector rotation-like oscillations inside the rigid surface) rather than the scissors-like picture of Lo Iudice and Palumbo. The spinM1 resonance is shown to be mainly generated by spin-flip transitions between the orbitals of the fp shell. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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